From 5f10acb5e970c464be213b54e7f2570392ad432b Mon Sep 17 00:00:00 2001
From: crusader <crusader@loafle.com>
Date: Thu, 22 Mar 2018 22:57:27 +0900
Subject: [PATCH] ing

---
 external/grpc/client.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/external/grpc/client.go b/external/grpc/client.go
index 9733c58..a4e4624 100644
--- a/external/grpc/client.go
+++ b/external/grpc/client.go
@@ -4,10 +4,13 @@ import (
 	"context"
 	"fmt"
 	"strings"
+	"sync"
 
 	ooas "git.loafle.net/overflow/overflow_api_server/golang"
 )
 
+var execMtx sync.RWMutex
+
 func Exec(ctx context.Context, method string, params []string) (string, error) {
 	if nil == grpcClient {
 		return "", fmt.Errorf("App: GRPC Client is not initialized")
@@ -26,10 +29,14 @@ func Exec(ctx context.Context, method string, params []string) (string, error) {
 		Method: sm[1],
 		Params: params,
 	}
-	var so *ooas.ServerOutput
-	if so, err = grpcClient.(ooas.OverflowApiServerClient).Exec(ctx, si); nil != err {
+
+	execMtx.RLock()
+	so, err := grpcClient.(ooas.OverflowApiServerClient).Exec(ctx, si)
+	if nil != err {
+		execMtx.RUnlock()
 		return "", err
 	}
+	execMtx.RUnlock()
 
 	return so.Result, nil
 }